Shear structure



Oct. 2l, 1941. G. T. MEYERs 2,259,764

SHEAR STRUCTURE Original Filed Sept. 15, 1939 3 Sheets-Sheet 2 A /N VEN TOR. George T Meyers.

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Ocvtf. 21, 1941. G. 1'. MYl-:Rs

sHEAR STRUCTURE original Filed Sept. 15, i939 /N VENTOR. Gecrge T Mayors.

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TTORNEYS Patented Oct. 21, 1941 SHEAR STRUCTURE George T. Meyers," Parkersburg, W. Va., assigner h to The Meyers Company, Parkersburg, W. Va.,

a corporation of West Virginia I Original application September 15,

Divided and this application 1939, serial April 25, 1941, Serial No. 390,327

Claims.

My invention relates to a shear structure. It.

has to do, more particularly, with a shear structurev adapted to be associated with apparatus for feeding molten glass in the form of a stream in order to divide the stream into charges of predetermined size.

As is well known, considerable diiliculty is encountered in the manufacture of glassware in attempts to eliminate the shear mark from the finished article. 'I'his shear mark is caused by the chilling eect of the shears as' they cut the stream of glass. Many eiorts have been made to overcome the shear marks'. These efforts have involved the-reheatingof the lower end of the stream of glass after a charge has been sheared therefrom. For this purpose, complicated mechanism is required.'V f One of the objects of my invention is to provide I a shear structure which is of such a nature .that

it will shear the glass without causing ,shear marks and, therefore, reheating of the lower end 'of the stream of glass will not be required.

Another object of my invention is to provide a shear structure of the'type indicated which is' of a very simple nature.

In its preferred form, my invention contemplates the provision of a shear structure which includes a plurality o'f movable blades adapted.

to pass through the stream of molten glass. These blades are of a novel shape. They are preferably curved upwardly so that as they cut through the glass they produce a concave depression in ythe lower end of the glass stream. The resultis that the last portion of the glass to be severed,-

. which is at the center of the stream, is forced upwardly into the stream at the center thereof where the glass is the hottest. Because this portion of the glass is forced back into the hottest portion'of the glass it will be reheated and a shear mark caused by thev chilling effect of the blades will be eliminated.

This application is a division of my co-pendim f Figure 4 is a sectional view 4-4'01 Figure 3.

Figure 5 is, ahorizontal sectional view taken substantially along line 5 5 of Figure 3.

Figure 6 is a detail showing the shapeof the taken along line openings in the cutting blades.

Figure 7 is a perspective view,

away, of .the shear structure.

Figure is a perspective view of a stream of glass having a gob s heared therefrom and illuspartly broken trating the shape impartedto the lower end of the stream by the shears.

Figure 9I is a vertical sectional view, more or less diagrammatic, illustrating how the stream of molten glass flows into the shear structure.

Figure 10 is a similar view showing the shear structure as it appears just after shearing-a charge from the stream.

Figure l1-is a similar view showing the charge dropping from the shear structure.

Figure 12 is a vertical sectional view illustrating a modification of my shear structure.

application Serial No. 295,055, nled September 15,

The preferred embodiment of my invention is illustrated in the accompanying drawings wherein similar characters of reference designate'corresponding parts and wherein:I

Figure 1 is a longitudinal section taken through a glass feeding spout associated therewith.

Figure 2 is a horizontal sectional view taken 4substantially along line 2-2 of Figuregl.'

Figure 3 is a vertical sectional view taken throughthe shear structure.

having my shear structure.

Figure 13 is a perspective view of the structure illustrated in Figure 12.

Figure 14 isa perspective view showing a gob orcharge sheared from the stream of glass and illustrating the shape imparted to the lower end of the stream by the shear structure of Figure 12.

With reference to the drawings, I have shown my shear structure in association with glass feeding means of the type disclosed in my Patent No` 2,079,519, issued May 4, 1937. "However, it is tc be understood that my shear structure may b'- employed with other types of glass feeders.

In the drawings, I have illustrated a spout y having a discharge oriflce 2 a'id means I for con trolling the flow of glass therethrough. Ther` elements may be the same as the correspondin elements disclosed in my patent.' Below the ori iice I mount my shear structure which is ind:I cated generally by thenumeral 4. y

The shearfatructure includes an upper'wate jacket portion` 5 which is annular form and i disposed directly below the orce of the spout. It is provided with a central opening 6 (Figures 3- and 4) in' which may be disposed a refractory bushing 1. The opening 6 is in alignment with the discharge orice of .the spout. The water on the lower surface of the water jacket 5. The

jacket portion 5 is hinged at l8 to thelower side of the spout. It normally heldin position by means of a latch 9.

Disposed below tubular housing l0. This housing has'its upperl end fitting within an annular shoulder ll formed the water jacket portion 5 is a member I is held in position by a collar member |2 (Figure 1) in which it is clamped. 'Ihe collar member is carried by an arm I3 which has its outer end slidably mounted in a guide Il. The shear structure may be moved away from the oriflce by loosening screws |2a in the collar I2. dropping'the housing Ill slightly and then sliding the arm I 3 laterally. Then the water Jacket portion 5 may be swung away from the orifice if desired.

As illustrated in Figures 3, 4, 5 and 7, the housing I0 has disposed therein a cylindrical member I5. 'I'his member I5 has a centrally disposed op'ening I6 of rectangular form. The member I5 is held within the member III by means of screws I1. Within the opening I3, cup-shaped members I3 and I9 are disposed.v 'I'he member I3 ts within the member I9, as indicated best in Figure 4. 'Ihe member I9 rotates on a trunnion 29 which is threaded into an opening 2| in the member I5 and extends into an opening 22 formed at the axis of the cup-shaped member I9. The member I3 is carried by a trunnion 23 which is threaded into an opening 24 formed in the member I5 and extends into an opening 25 in the member I3 at the axis thereof. Thus, the cup-shaped members intert with each other lbut are free to rotate relative to each other. The annular ilanges I3a and |9a thereof are superimposed. 'I'he ange |8a is provided with openings I3b and I3c which are almost diametrically opposed. 'I'he ange |9a is provided with openings I9b and |9c which are almost diametrically opposed. The openings |3c and |9c and the openings |3b and |9b are adapted to be brought into alignment with each other at the proper times by relative rotation of the members I9 and I9. However, when the openings |3c and |9c are in alignment with each other (Figure 3) the openings I3b and I9b are out of alignment with each other and vice versa. Recessed into the under surface of the ilange in the upper surface of the flange |3a adjacent the openings |3c is a shear blade 21. These blades have the same arc of curvature as the flanges I3a and |9a and are disposed in superimposed contacting relationship. The blade ends pivotally connected to a link 32 (Figure 2) as at 33 and 34. The link 32 is provided intermediate its ends as at 33 to a stationary support 33. One end of the line 32 is pivotally connected to a piston rod 31 as at 33. The piston rod forms a part of a cylinder and piston unit 39 which is adjustably mounted on guides 49 attached to the lower side of the spout. Air lines Ila and 42a are connected to the unit 39 and suitable controls may be provided for movl ing the piston in opposite directions. It will be apparent that when the piston is moved in one direction so that the piston rod 31 moves outwardly, the link 32 will be pivoted around the point 35. This will cause the rack 33 to move to the left (Figure 2) and the rack3| to move to I9a adjacent I9c is the shear blade 23. Recessed 26 is provided with an opening 26e lin aligny ment with the opening |9c while the blade 21 has an opening 21c in alignment with the opening |8c. The shape of the openings 23e and 21c is illustrated best in Figure 6. These openings are substantially square but are so disposed that the edges of the openings are at approximately 45 degree anglesrelative to the path of movement ofA the blades. The edges of the openings 23e and 21c are formed into cutting edges. It will be noted that the openings |9c and I3c are of a diameter approximating the diagonal dimension of the openings 23e and 21c. The edge of the opening |9c,is beveled as indicated at I9d while the edge oi the opening I 3c is beveled as indicated at I3d.

In order to rotate the members I3 and I9 relative to each other, I provide gear and rack mechanism. The member I8 has a gear portion 23 formed thereon while the member I9 has a gearportion 29 formed thereon. The portion 29 meshes with a rack 30while the portion 29 mesh` the right.y This, in turn, will rotate the member I3 vin a clockwise direction and the member I9 in a counter-clockwise direction. Movement of the piston rod in the opposite direction will produce rotation of these members in reverse directions.

In the use of the shear structure, it will be disclosed below the outlet orifice and the members I3 and I9 will be in the relative positions indicated in Figure 3. That is, the openings |9c and I3c will bev in alignment and the openings 23o and 21c in the shear blades will also be in alignment as indicated by the full lines in Figure 6. The openings |3b and |9b will be out of alignment so that the chamber 4| formed within members I3 and I9 will be closed and no air will be permitted to enter thereinto or up into the orifice of the spout to adversely affect the temperature of the glass. As indicated in Figure 9, the glass stream will flow down through the openings in the shear blades and members I3 and I9 into the chamber 4 I At the proper time relative rotation of members I3 and |9 will be produced which, in turn, will produce relative rotation of the shear blades. The shear blades will move in the manner illustrated by the dotted lines in Figure 6 causingthe opening between them to gradually become smaller and thereby shearing the glass. When the glass charge is sheared from the stream it will drop through the chamber 4|, as indicated in Figure l0, and will pass through the aligning openings |3b and I9b as illustrated in Figure 1l. Immediately after the charge, passes from the chamber Il vinto the mold, rotation of membersv I3 and I9 will be reversed again closing the lowet end of the chamber 4| but establishing communi cation of such chamber with the spout orifice'. With this shear structure it is possible to havev a moldl disposed directly adjacent the spout oriiice and the glass charge will be protected from drafts or atmospheric'conditions during its passage from the spout -to the mold. l

One of the most important features of my invention resides in the fact that with my shear structure, the glass is sheared in such a manner that the shear mark will be eliminated. 'Ihis is due to the shape of the blades 26 and 21. These blades are curved as previously stated. In cutting the glass they produce a plano-cylinder curve 42 on the lower end of the stream of glass. In other words, as the blades move through the glass, they force upwardly the center portion of the glass. which is the last portion sheared, into the hotter portion of the glass at the center of the stream. Thus, the chilling eiIect of shears on the glass is overcome due to the fact that the chilled glass is forced up into the hot center of the stream. It will be noted that the shear blades are of such shape that they act to the same extent on the opposite sides of the stream of glass and will consequently' center the stream of glass.

, In Figures 12 and 13 I illustrate a modification of my shear structure. In this form the members 43 and 444 which are used instead of the members I8 and I9 are of spherical shape rather than cylindrical or cup-shaped. 'I'he blades 45 and 46 carried by these members are also of a spherical curvature. The members 43 and 44 will be rotated relative to each other in the same manner as the members I8 and I9. However, because of the spherical shape of the blades, a concave spherical depression 42h will be formed in the lower end of the stream-of glass, as indicated in Figure 14. v

Various other advantages will be apparent from the preceding description, the drawings and the following claims.

Having thus described my invention, what I claim is: 'Y Y 1. A shear structure for molten glass comprising an outer hollow member and an inner hollow member, shear blades associated with the different hollow members, a nd means for producing relative movement of said hollow members and relative movement ofsaid shear blades, said hollow members having a set of openings adapted to be brought into alignment by the relative movement thereof to permit' astream of glass to flow thereinto and a set ofopenings disposed opposite the iirst set adapted to be brought into alignment by the relative movement thereof to permit the severed charge to pass out of saidhollow members.

' 2. A shear structure for molten glass comprising an outer member of cylindrical form and an inner member of cylindrical form mounted for rotation about. the axes, means for producing relative rotation of said members, said inner member and outer member being provided with a set of openings adapted to be brought into alignment by the relative rotation thereof to permit the glass to flow into the interior thereof, shear blades having the same curvature as the walls of said inner and outer members being carried by theA inner and outer members and being provided with openings in alignment'with said openings in said members, said openings inthe shear blades being adapted to receive the stream of glass, rotation of said inner and outer members being adapted to move said shear blades rela-` tive to each other to shear the glass and to simultaneously move said openings in said inner and outer members out 'of alignment with each other, said inner and 'outer members being provided with another set of openings'substantially diametrically opposed to the rst openings for permitting the severedcharge to pass therethrough, said last-named openings being out of alignment when the rst-named openings are in alignment and vice versa.

3. A shear structure for molten glass compriscarried by the inner and outer members and being provided with openings in alignment with said openings in said members, said openings in the sheary blades being adapted to receive the stream of glass, rotation of said inner and outer members being adapted to move said shear blades relative to each other to shear theglass and to 'I simultaneously move said openings in said inner and outer members out of alignment with each other, said inner and outer members being provided with another set of openings substantially diametrically opposed to the lrst openings for permitting the severed charge to` pass therethrough,.said last-named openings being out of alignment when the first-named openings are in Ialignment and vice versa.

4. A shear structure for molten glass comprising an outer member of cylindrical form and an inner member of cylindrical form mounted for rotation about their axes, said inner member and outer member being provided with a set of openings adapted to be brought into alignment by the relative rotation thereof to permit the glassto flow into the interior thereof, shear blades having inner and outer members being adapted to move,

said shear blades relative to each other to shear the glass and to simultaneously move said openings in said inner and outer members out of alignment with each other, said inner and outer members being provided with another set of openings substantially diametrically opposed to the first openings for permitting the severed charge to pass therethrough, said last-named openings being out of alignment when the rstnamed openings are in alignment and vice, versa, means 'for producing relative rotation of said members, said means comprising gear and rack mechanism for simultaneously rotating said members in opposite directions.

5. A shear structure for molten glass comprising an outer member of cylindrical form and an inner member of cylindrical form mounted for rotation about their axes, means for producing relative rotation of said members, said inner member and outer member being provided with a set of openings adapted to be brought into alignment by the relative rotation thereof to permit the glass to low into the interior thereof, shear blades carried bythe inner and outer members and being provided'with openings in alignment A with said openings in said members, said openings in the shear blades being adapted to receive the stream of glass, rotation of said inner and ing an outer member of spherical form and` an inner member of spherical form, means for producing relative rotation of said members, said inner member and outer member being provided with a set of openings adapted to be brought into alignment by the relative rotation thereof to permit the glass to ow into the interior thereof, shear blades having the same curvature as the walls of said inner and outer members being outer members being adapted to move said shear blades .relative to each other to shearthe glass and to simultaneously move said openings in said inner and outer members out of ,alignment with each other, said inner and outer members being provided withl another set-of openings substantially diametrically opposed to the rst openings for permitting the severed charge to pass therethrough, said 'last-named openings being out of alignment when the mst-named openings are in alignment and vice versa. Y

GEORGE T. ,MEYER 

